They are a great way to get tier 1 links. Of course you must remember that you will need to build up each site so that they will help pass on the link juice. If you just create a new site and don't promote it, the links are not really going to be that valuable. But every little bit helps.

They can be much better, of course you need to remember that those other web 2.0 sites are already established. Which is why they are so popular when building links.

In the long run, as long as you are promoting and establishing these domains, they can end up being much more powerful, because they will be very targeted to your niche, and there are not going to be thousands of people building links from your domain... just you.

No worries, just want to add one thing, test whatever you do, maybe split test on 2 sites with diferent technique for each. This works for me but without proper case study it could be anomaly so be aware.

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